Which of the following can result in irregularities leading to cancer?

A. The body programming its cells to die

B. The body using cyclins to regulate the timing of the cell cycle

C. The body failing to respond to signals that slow the cell cycle

D. The body utilizing growth factors in development

C. The body failing to respond to signals that slow the cell cycle. Cancer is basically when cells grow at a rapid rate without control. A isn't right since the death of cells is the opposite of uncontrolled growth. B isn't correct since the body uses cyclins to control the timing of the cell cycle, and don't just grow them, and D isn't correct since the body has to utilize growth factors to develop at all.